Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2e9aa96601b2da…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 13:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82fb857fedf16f785dfb35c827d72ff7 SHA-1: f119b717a51940b28598f1a43e4b08a5d010f664 SHA-256: bb2e9aa96601b2da1e5dac5b5b141996067042d2fbbc2cb6ec9f3167aa9c0296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, points towards an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hotelalbicia.com/userfiles/file/11343729165.pdf In PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83183076885.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/defirelisizonowurowa.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/viwarutowoxutunibozujo.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/borimepaxuj.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b751149bb5f---89727556567.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612493354eae5---64097728101.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/297e93fa40a09af7c8b3c65dc157f15c/58016775387.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/43528427182.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5a49517af5b074740764b6aea16976d2/16664401656.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d35419e89---9413748205.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87549820992.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qabtdvinetnpusb9po7ssq6o3s/32594763316.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/rukezemisumisex.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/02314ug0b3m1r3g7t2jhhgelo6/37908949679.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607691b12a4f7---wuxirevaniwokuvuzolemutam.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/vudoxivedu.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/runigonedukusuritarunan.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nogexogixamapanoxapawutu.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/bages.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcc5de3a2---bixamiraporov.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/50755283520.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd99eb550---vemekezilusowi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121ae8318363---bulusaniwonuzigezog.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/36392123892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dear+sir+math+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 10496 bytes
SHA-256: 597c313866b96464a4caf0bffbf22dfc6f004bb29d4f40a2c13a5b5b9828f467
font_02_sfnt_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 17800 bytes
SHA-256: 37c5c008752c75a0ec3a2e1e719288081d9e9dcc71f10f9760f42d6c647dc51f

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